Java Spring：从另一个 bean 访问 bean 属性
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Spring: Access bean property from another bean
提问by carlspring
I have two beans:
我有两个豆子：
ConfigurationManager:
配置管理器：
public class ConfigurationManager
{
private Configuration configuration;
public void init() { ... } // Loads a configuration
// Getters and setters
}
DataCenter:
数据中心：
public class DataCenter
{
private Configuration configuration;
...
// Getters and setters
}
I would like to get the configurationfield of the ConfigurationManager from within my DataCenter bean and I'm not quite sure what the syntax is.
我想configuration从我的数据中心 bean 中获取ConfigurationManager的字段，但我不太确定语法是什么。
Here's my context file:
这是我的上下文文件：
<bean id="configurationManager"
class="com.foo.ConfigurationManager"
init-method="init">
<property name="configurationFile" value="etc/configuration.xml"/>
</bean>
<bean id="dataCenter"
class="com.foo.DataCenter">
<!-- <property name="storages" ref="configurationManager."/> -->
</bean>
Could somebody please show me how to do this? Thanks in advance!
有人可以告诉我如何做到这一点吗？提前致谢！
采纳答案by Sotirios Delimanolis
You can use Spring Expression Languageto refer to other bean properties by name. Here's the example given in the docs
您可以使用Spring 表达式语言按名称引用其他 bean 属性。这是文档中给出的示例
<bean id="numberGuess" class="org.spring.samples.NumberGuess">
<property name="randomNumber" value="#{ T(java.lang.Math).random() * 100.0 }"/>
<!-- other properties -->
</bean>
<bean id="shapeGuess" class="org.spring.samples.ShapeGuess">
<property name="initialShapeSeed" value="#{ numberGuess.randomNumber }"/>
<!-- other properties -->
</bean>
In your case, you could use
在你的情况下，你可以使用
<bean id="configurationManager"
class="com.foo.ConfigurationManager"
init-method="init">
<property name="configurationFile" value="etc/configuration.xml"/>
</bean>
<bean id="dataCenter"
class="com.foo.DataCenter">
<property name="storages" value="#{configurationManager.configuration}"/>
</bean>
In similar fashion, you can use @Valueannotation in @Beanmethodsor use it in @Autowiredmethods.
以类似的方式，您可以@Value在@Bean方法中使用注解或在方法中使用它@Autowired。
回答by Evgeniy Dorofeev
try this
尝试这个
<bean id="dataCenter" class="com.foo.DataCenter">
<property name="configuration" value="#{configurationManager.configuration}"/>
</bean>
